单 位：
重庆师范大学地理与旅游学院;重庆市气象局
关键词：
TRMM降水数据;精度验证;地形因子;重庆市
摘 要：
在地形复杂的重庆地区,利用研究区内34个气象站点实测数据,分别从年、季、月3个尺度,对2000—2011年间TRMM 3B43降水数据精度进行了验证,并分析了高程和坡度对月尺度验证结果的影响,同时利用主成分分析法比较了高程与坡度对TRMM 3B43降水数据的影响程度。研究表明:(1)年尺度上,TRMM 3B43年降水数据普遍高于气象站点的实测结果(平均偏高5.86%),渝西、渝南的结果比渝东北的准确。季尺度上,秋季拟合效果高于其它3个季节。月尺度上,相关系数R=0.85,两者之间存在显著相关性。(2)逐站点验证,研究区TRMM 3B43月降水数据具有较高精度(相关系数均大于0.80)。(3)随着海拔的升高,相关系数呈"增加—减少—增加"的变化趋势,绝对偏差呈减小趋势;随着坡度的升高,绝对偏差呈"增加—减少—增加"的变化趋势,绝对偏差呈线性增加的趋势。(4)利用主成分分析方法得出,高程对数据精度的影响大于坡度。
译 名：
Accuracy Evaluation of Tropical Rainfall Measuring Mission Precipitation Data in Complex Mountainous Areas——Taking Chongqing City as an Example
作 者：
WU Jian-feng;CHEN A-lin;JI Tao;LI Jun;LU Xiao-ping;College of Geography & Tourism,Chongqing Normal University;Key Laboratory of GIS Application,Chongqing Municipal Education Commission;Chongqing Meteorological Administration;
关键词：
TRMM precipitation data;;accuracy verification;;topographical factors;;Chongqing City
摘 要：
Chongqing City is a typical area with complicated terrain.The accuracy of TRMM(Tropical Rainfall Measuring Mission)3B43precipitation data has been verified by period of year,season and month through the data getting from 34 meteorological stations and the impact of elevation and slope on the result of monthly scale were analyzed.The results shows:(1)Counted by year,TRMM 3B43 annual precipitation is generally more than the measured data(on average more than 5.86%),and in Western Chongqing City and Southern Chongqing City are more accurate than in Northeastern Chongqing City.Meanwhile,by season,the precipitation of autumn is more accurate than that of the other three seasons.For the month scale,the relation between TRMM 3B43 monthly precipitation data and the measured precipitation was obvious(R=0.85).(2)From each meteorological station,the data are more accurate in the researched areas,and the correlation coefficients are higher than 0.8.(3)As the altitude increases,the correlation coefficient Rshows a "increase—decrease—increase" trend,and the absolute deviation is decreasing.However when the gradient increases,the absolute deviation shows a "increase—decrease—increase" trend,and the absolute deviation exhibits linear increasing trend.(4)Analysis by using principal component shows that the impact of elevation on data accuracy was greater then that of slope.
